Eaton NZMB1-A40 Molded Case Breaker - 25 kAIC
Part Number: NZMB1-A40
Quick Summary
Eaton NZMB1-A40 molded case circuit breaker protects distribution circuits in industrial switchgear and control panels. For engineers contending with nuisance trips and tight panel layouts, this unit delivers a precise thermal-magnetic trip and a front-frame clamp that simplifies mounting. Compliance information is provided by the manufacturer, with a warranty of one year from installation or eighteen months from shipment, whichever comes first. With a 32–40 A setting range, 25 kAIC short-circuit rating, and operation at 440 Vac in a three-pole NZM1 frame, it combines robust protection with straightforward maintenance. The rocker lever offers reliable, tactile operation while compact dimensions optimize space in crowded assemblies.
Product Information
Extended Description
NZMB1-A40 Eaton: Eaton Series NZM complete molded case circuit breaker, NZM1-frame, NZMB1, Thermal-magnetic trip type, 320-400A trip rating, Three-pole, 40A, 440 Vac, 25 kAIC, Distribution circuit protection, Rocker lever, 32-40A, Front frame clamp, 32-40A
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB1-A40
EAN
4015082590758
Product Length/Depth
2.68 in
Product Height
5.71 in
Product Width
3.54 in
Product Weight
3 lb
Warranty
Eaton Selling Policy 25-000, one (1) year from the date of installation of the Product or eighteen (18) months from the date of shipment of the Product, whichever occurs first.
Compliances
Contact Manufacturer
Amperage Rating
40 A
Voltage rating
440 Vac
Trip Type
T268
Circuit breaker type
NZMB1
Frame
NZM1
Class
Distribution circuit protection
Accessories
Rocker lever
Setting Range Ol Protector
32-40A
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Connection
Front frame clamp
Overload range
32-40A
Number of poles
Three-pole
Trip rating
320-400 A
Feature → Business Impact → Application: Thermal-magnetic trip type delivers accurate protection against overloads and short circuits, reducing nuisance trips and equipment wear in critical power circuits. This translates to lower maintenance costs and longer service life for motors and equipment in manufacturing lines. Application: Ideal for distribution circuit protection in control panels and switchgear where reliable tripping performance at 440 Vac is required. Feature → Business Impact → Application: NZM1 frame compatibility and front frame clamp enable quick, secure mounting in existing NZM1-based enclosures, reducing installation time and field wiring complexity. Application: Suitable for retrofits or new builds in industrial facilities with three-pole protection requirements. Feature → Business Impact → Application: 32–40 A setting range provides precise tailoring of protection to load profiles, enabling energy savings and minimized downtime. Application: Panel builders can optimize feeder protection without overrating devices. Feature → Business Impact → Application: 25 kAIC interrupt capacity ensures resilience against high fault currents, improving overall system reliability. Application: Critical in systems with moderate to high fault current potential in distribution networks.
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FAQs
The NZMB1-A40 uses a front frame clamp and three-pole assembly designed for NZM1 frames, enabling straightforward mounting in compatible Eaton panels. Verify enclosure clearance and terminal space for 40 A devices, then follow the manufacturer’s wiring guidelines to ensure proper torque and conductor sizing for 440 Vac systems.
Key specs include a 40 A amperage rating, 440 Vac, 25 kAIC short-circuit breaking capacity, three poles, NZMB1 circuit breaker type within the NZM1 frame, and a 32–40 A overload setting. The unit uses a thermal-magnetic trip (T268) and includes a rocker lever for ease of operation.
Yes, its three-pole design, 25 kAIC interrupt rating, and 440 Vac operation make it suitable for motor control center feeders and panelboard protections where reliable short-circuit and overload protection are required. Ensure motor inrush and startup currents are considered within the 32–40 A setting range for optimal protection.
Compliances are specified by the manufacturer; confirm applicable standards with Eaton for your region and installation. The warranty covers one year from installation or eighteen months from shipment, whichever occurs first, providing a clear basis for maintenance planning and ROI assessments.
The device’s reliable thermal-magnetic trip and robust 25 kAIC rating reduce unexpected outages, lowering maintenance costs and downtime. With straightforward mounting and a durable rocker lever, field servicing is minimized, improving total cost of ownership in mid- to high-current distribution applications.